sound/hda/ext/hdac_ext_bus.c

   1 /*
   2  *  hdac-ext-bus.c - HD-audio extended core bus functions.
   3  *
   4  *  Copyright (C) 2014-2015 Intel Corp
   5  *  Author: Jeeja KP <jeeja.kp@intel.com>
   6  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  This program is distributed in the hope that it will be useful, but
  13  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  General Public License for more details.
  16  *
  17  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <linux/io.h>
  23 #include <sound/hdaudio_ext.h>
  24
  25 MODULE_DESCRIPTION("HDA extended core");
  26 MODULE_LICENSE("GPL v2");
  27
  28 static void hdac_ext_writel(u32 value, u32 __iomem *addr)
  29 {
  30         writel(value, addr);
  31 }
  32
  33 static u32 hdac_ext_readl(u32 __iomem *addr)
  34 {
  35         return readl(addr);
  36 }
  37
  38 static void hdac_ext_writew(u16 value, u16 __iomem *addr)
  39 {
  40         writew(value, addr);
  41 }
  42
  43 static u16 hdac_ext_readw(u16 __iomem *addr)
  44 {
  45         return readw(addr);
  46 }
  47
  48 static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
  49 {
  50         writeb(value, addr);
  51 }
  52
  53 static u8 hdac_ext_readb(u8 __iomem *addr)
  54 {
  55         return readb(addr);
  56 }
  57
  58 static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
  59                            size_t size, struct snd_dma_buffer *buf)
  60 {
  61         return snd_dma_alloc_pages(type, bus->dev, size, buf);
  62 }
  63
  64 static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
  65 {
  66         snd_dma_free_pages(buf);
  67 }
  68
  69 static const struct hdac_io_ops hdac_ext_default_io = {
  70         .reg_writel = hdac_ext_writel,
  71         .reg_readl = hdac_ext_readl,
  72         .reg_writew = hdac_ext_writew,
  73         .reg_readw = hdac_ext_readw,
  74         .reg_writeb = hdac_ext_writeb,
  75         .reg_readb = hdac_ext_readb,
  76         .dma_alloc_pages = hdac_ext_dma_alloc_pages,
  77         .dma_free_pages = hdac_ext_dma_free_pages,
  78 };
  79
  80 /**
  81  * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
  82  * @ebus: the pointer to extended bus object
  83  * @dev: device pointer
  84  * @ops: bus verb operators
  85  * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
  86  * default ops
  87  *
  88  * Returns 0 if successful, or a negative error code.
  89  */
  90 int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
  91                         const struct hdac_bus_ops *ops,
  92                         const struct hdac_io_ops *io_ops,
  93                         const struct hdac_ext_bus_ops *ext_ops)
  94 {
  95         int ret;
  96         static int idx;
  97
  98         /* check if io ops are provided, if not load the defaults */
  99         if (io_ops == NULL)
 100                 io_ops = &hdac_ext_default_io;
 101
 102         ret = snd_hdac_bus_init(bus, dev, ops, io_ops);
 103         if (ret < 0)
 104                 return ret;
 105
 106         bus->ext_ops = ext_ops;
 107         bus->idx = idx++;
 108         bus->cmd_dma_state = true;
 109
 110         return 0;
 111 }
 112 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
 113
 114 /**
 115  * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
 116  * @ebus: the pointer to extended bus object
 117  */
 118 void snd_hdac_ext_bus_exit(struct hdac_bus *bus)
 119 {
 120         snd_hdac_bus_exit(bus);
 121         WARN_ON(!list_empty(&bus->hlink_list));
 122 }
 123 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
 124
 125 static void default_release(struct device *dev)
 126 {
 127         snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
 128 }
 129
 130 /**
 131  * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device
 132  * @ebus: hdac extended bus to attach to
 133  * @addr: codec address
 134  *
 135  * Returns zero for success or a negative error code.
 136  */
 137 int snd_hdac_ext_bus_device_init(struct hdac_bus *bus, int addr,
 138                                         struct hdac_device *hdev)
 139 {
 140         char name[15];
 141         int ret;
 142
 143         hdev->bus = bus;
 144
 145         snprintf(name, sizeof(name), "ehdaudio%dD%d", bus->idx, addr);
 146
 147         ret  = snd_hdac_device_init(hdev, bus, name, addr);
 148         if (ret < 0) {
 149                 dev_err(bus->dev, "device init failed for hdac device\n");
 150                 return ret;
 151         }
 152         hdev->type = HDA_DEV_ASOC;
 153         hdev->dev.release = default_release;
 154
 155         ret = snd_hdac_device_register(hdev);
 156         if (ret) {
 157                 dev_err(bus->dev, "failed to register hdac device\n");
 158                 snd_hdac_ext_bus_device_exit(hdev);
 159                 return ret;
 160         }
 161
 162         return 0;
 163 }
 164 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
 165
 166 /**
 167  * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
 168  * @hdev: hdac device to clean up
 169  */
 170 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
 171 {
 172         snd_hdac_device_exit(hdev);
 173         kfree(hdev);
 174 }
 175 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);
 176
 177 /**
 178  * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
 179  *
 180  * @ebus: HD-audio extended bus
 181  */
 182 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
 183 {
 184         struct hdac_device *codec, *__codec;
 185         /*
 186          * we need to remove all the codec devices objects created in the
 187          * snd_hdac_ext_bus_device_init
 188          */
 189         list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
 190                 snd_hdac_device_unregister(codec);
 191                 put_device(&codec->dev);
 192         }
 193 }
 194 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
 195 #define dev_to_hdac(dev) (container_of((dev), \
 196                         struct hdac_device, dev))
 197
 198 static inline struct hdac_driver *get_hdrv(struct device *dev)
 199 {
 200         struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
 201         return hdrv;
 202 }
 203
 204 static inline struct hdac_device *get_hdev(struct device *dev)
 205 {
 206         struct hdac_device *hdev = dev_to_hdac_dev(dev);
 207         return hdev;
 208 }
 209
 210 static int hda_ext_drv_probe(struct device *dev)
 211 {
 212         return (get_hdrv(dev))->probe(get_hdev(dev));
 213 }
 214
 215 static int hdac_ext_drv_remove(struct device *dev)
 216 {
 217         return (get_hdrv(dev))->remove(get_hdev(dev));
 218 }
 219
 220 static void hdac_ext_drv_shutdown(struct device *dev)
 221 {
 222         return (get_hdrv(dev))->shutdown(get_hdev(dev));
 223 }
 224
 225 /**
 226  * snd_hda_ext_driver_register - register a driver for ext hda devices
 227  *
 228  * @drv: ext hda driver structure
 229  */
 230 int snd_hda_ext_driver_register(struct hdac_driver *drv)
 231 {
 232         drv->type = HDA_DEV_ASOC;
 233         drv->driver.bus = &snd_hda_bus_type;
 234         /* we use default match */
 235
 236         if (drv->probe)
 237                 drv->driver.probe = hda_ext_drv_probe;
 238         if (drv->remove)
 239                 drv->driver.remove = hdac_ext_drv_remove;
 240         if (drv->shutdown)
 241                 drv->driver.shutdown = hdac_ext_drv_shutdown;
 242
 243         return driver_register(&drv->driver);
 244 }
 245 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
 246
 247 /**
 248  * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
 249  *
 250  * @drv: ext hda driver structure
 251  */
 252 void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
 253 {
 254         driver_unregister(&drv->driver);
 255 }
 256 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);